One of ours as issues occasionally, but it's not enough to take out the battery. We have to ale it out and leave it out overnight. We sent it in to pentax once and they reported they could find nothing wrong with it. Last time it got stuck on ƒ8 and 100 ISO and it couldn't be changed from those settings...lots of ƒ8 pictures that trip, you know "ƒ8 and be there". When it got home we pulled the battery for 18 hours and it powered up normally after that. It seems to have something to do with leaving the camera on and the shutter release being held down by the foam in the waterproof camera case.
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